drivers/thermal/rcar_thermal.c

   1 /*
   2  *  R-Car THS/TSC thermal sensor driver
   3  *
   4  * Copyright (C) 2012 Renesas Solutions Corp.
   5  * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; version 2 of the License.
  10  *
  11  *  This program is distributed in the hope that it will be useful, but
  12  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  *  General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License along
  17  *  with this program; if not, write to the Free Software Foundation, Inc.,
  18  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  19  */
  20 #include <linux/delay.h>
  21 #include <linux/err.h>
  22 #include <linux/irq.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/io.h>
  25 #include <linux/module.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/reboot.h>
  28 #include <linux/slab.h>
  29 #include <linux/spinlock.h>
  30 #include <linux/thermal.h>
  31
  32 #define IDLE_INTERVAL   5000
  33
  34 #define COMMON_STR      0x00
  35 #define COMMON_ENR      0x04
  36 #define COMMON_INTMSK   0x0c
  37
  38 #define REG_POSNEG      0x20
  39 #define REG_FILONOFF    0x28
  40 #define REG_THSCR       0x2c
  41 #define REG_THSSR       0x30
  42 #define REG_INTCTRL     0x34
  43
  44 /* THSCR */
  45 #define CPCTL   (1 << 12)
  46
  47 /* THSSR */
  48 #define CTEMP   0x3f
  49
  50 struct rcar_thermal_common {
  51         void __iomem *base;
  52         struct device *dev;
  53         struct list_head head;
  54         spinlock_t lock;
  55 };
  56
  57 struct rcar_thermal_priv {
  58         void __iomem *base;
  59         struct rcar_thermal_common *common;
  60         struct thermal_zone_device *zone;
  61         struct delayed_work work;
  62         struct mutex lock;
  63         struct list_head list;
  64         int id;
  65         int ctemp;
  66 };
  67
  68 #define rcar_thermal_for_each_priv(pos, common) \
  69         list_for_each_entry(pos, &common->head, list)
  70
  71 #define MCELSIUS(temp)                  ((temp) * 1000)
  72 #define rcar_zone_to_priv(zone)         ((zone)->devdata)
  73 #define rcar_priv_to_dev(priv)          ((priv)->common->dev)
  74 #define rcar_has_irq_support(priv)      ((priv)->common->base)
  75 #define rcar_id_to_shift(priv)          ((priv)->id * 8)
  76
  77 #ifdef DEBUG
  78 # define rcar_force_update_temp(priv)   1
  79 #else
  80 # define rcar_force_update_temp(priv)   0
  81 #endif
  82
  83 /*
  84  *              basic functions
  85  */
  86 #define rcar_thermal_common_read(c, r) \
  87         _rcar_thermal_common_read(c, COMMON_ ##r)
  88 static u32 _rcar_thermal_common_read(struct rcar_thermal_common *common,
  89                                      u32 reg)
  90 {
  91         return ioread32(common->base + reg);
  92 }
  93
  94 #define rcar_thermal_common_write(c, r, d) \
  95         _rcar_thermal_common_write(c, COMMON_ ##r, d)
  96 static void _rcar_thermal_common_write(struct rcar_thermal_common *common,
  97                                        u32 reg, u32 data)
  98 {
  99         iowrite32(data, common->base + reg);
 100 }
 101
 102 #define rcar_thermal_common_bset(c, r, m, d) \
 103         _rcar_thermal_common_bset(c, COMMON_ ##r, m, d)
 104 static void _rcar_thermal_common_bset(struct rcar_thermal_common *common,
 105                                       u32 reg, u32 mask, u32 data)
 106 {
 107         u32 val;
 108
 109         val = ioread32(common->base + reg);
 110         val &= ~mask;
 111         val |= (data & mask);
 112         iowrite32(val, common->base + reg);
 113 }
 114
 115 #define rcar_thermal_read(p, r) _rcar_thermal_read(p, REG_ ##r)
 116 static u32 _rcar_thermal_read(struct rcar_thermal_priv *priv, u32 reg)
 117 {
 118         return ioread32(priv->base + reg);
 119 }
 120
 121 #define rcar_thermal_write(p, r, d) _rcar_thermal_write(p, REG_ ##r, d)
 122 static void _rcar_thermal_write(struct rcar_thermal_priv *priv,
 123                                 u32 reg, u32 data)
 124 {
 125         iowrite32(data, priv->base + reg);
 126 }
 127
 128 #define rcar_thermal_bset(p, r, m, d) _rcar_thermal_bset(p, REG_ ##r, m, d)
 129 static void _rcar_thermal_bset(struct rcar_thermal_priv *priv, u32 reg,
 130                                u32 mask, u32 data)
 131 {
 132         u32 val;
 133
 134         val = ioread32(priv->base + reg);
 135         val &= ~mask;
 136         val |= (data & mask);
 137         iowrite32(val, priv->base + reg);
 138 }
 139
 140 /*
 141  *              zone device functions
 142  */
 143 static int rcar_thermal_update_temp(struct rcar_thermal_priv *priv)
 144 {
 145         struct device *dev = rcar_priv_to_dev(priv);
 146         int i;
 147         int ctemp, old, new;
 148
 149         mutex_lock(&priv->lock);
 150
 151         /*
 152          * TSC decides a value of CPTAP automatically,
 153          * and this is the conditions which validate interrupt.
 154          */
 155         rcar_thermal_bset(priv, THSCR, CPCTL, CPCTL);
 156
 157         ctemp = 0;
 158         old = ~0;
 159         for (i = 0; i < 128; i++) {
 160                 /*
 161                  * we need to wait 300us after changing comparator offset
 162                  * to get stable temperature.
 163                  * see "Usage Notes" on datasheet
 164                  */
 165                 udelay(300);
 166
 167                 new = rcar_thermal_read(priv, THSSR) & CTEMP;
 168                 if (new == old) {
 169                         ctemp = new;
 170                         break;
 171                 }
 172                 old = new;
 173         }
 174
 175         if (!ctemp) {
 176                 dev_err(dev, "thermal sensor was broken\n");
 177                 return -EINVAL;
 178         }
 179
 180         /*
 181          * enable IRQ
 182          */
 183         if (rcar_has_irq_support(priv)) {
 184                 rcar_thermal_write(priv, FILONOFF, 0);
 185
 186                 /* enable Rising/Falling edge interrupt */
 187                 rcar_thermal_write(priv, POSNEG,  0x1);
 188                 rcar_thermal_write(priv, INTCTRL, (((ctemp - 0) << 8) |
 189                                                    ((ctemp - 1) << 0)));
 190         }
 191
 192         dev_dbg(dev, "thermal%d  %d -> %d\n", priv->id, priv->ctemp, ctemp);
 193
 194         priv->ctemp = ctemp;
 195
 196         mutex_unlock(&priv->lock);
 197
 198         return 0;
 199 }
 200
 201 static int rcar_thermal_get_temp(struct thermal_zone_device *zone,
 202                                  unsigned long *temp)
 203 {
 204         struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
 205
 206         if (!rcar_has_irq_support(priv) || rcar_force_update_temp(priv))
 207                 rcar_thermal_update_temp(priv);
 208
 209         mutex_lock(&priv->lock);
 210         *temp =  MCELSIUS((priv->ctemp * 5) - 65);
 211         mutex_unlock(&priv->lock);
 212
 213         return 0;
 214 }
 215
 216 static int rcar_thermal_get_trip_type(struct thermal_zone_device *zone,
 217                                       int trip, enum thermal_trip_type *type)
 218 {
 219         struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
 220         struct device *dev = rcar_priv_to_dev(priv);
 221
 222         /* see rcar_thermal_get_temp() */
 223         switch (trip) {
 224         case 0: /* +90 <= temp */
 225                 *type = THERMAL_TRIP_CRITICAL;
 226                 break;
 227         default:
 228                 dev_err(dev, "rcar driver trip error\n");
 229                 return -EINVAL;
 230         }
 231
 232         return 0;
 233 }
 234
 235 static int rcar_thermal_get_trip_temp(struct thermal_zone_device *zone,
 236                                       int trip, unsigned long *temp)
 237 {
 238         struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
 239         struct device *dev = rcar_priv_to_dev(priv);
 240
 241         /* see rcar_thermal_get_temp() */
 242         switch (trip) {
 243         case 0: /* +90 <= temp */
 244                 *temp = MCELSIUS(90);
 245                 break;
 246         default:
 247                 dev_err(dev, "rcar driver trip error\n");
 248                 return -EINVAL;
 249         }
 250
 251         return 0;
 252 }
 253
 254 static int rcar_thermal_notify(struct thermal_zone_device *zone,
 255                                int trip, enum thermal_trip_type type)
 256 {
 257         struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
 258         struct device *dev = rcar_priv_to_dev(priv);
 259
 260         switch (type) {
 261         case THERMAL_TRIP_CRITICAL:
 262                 /* FIXME */
 263                 dev_warn(dev, "Thermal reached to critical temperature\n");
 264                 break;
 265         default:
 266                 break;
 267         }
 268
 269         return 0;
 270 }
 271
 272 static struct thermal_zone_device_ops rcar_thermal_zone_ops = {
 273         .get_temp       = rcar_thermal_get_temp,
 274         .get_trip_type  = rcar_thermal_get_trip_type,
 275         .get_trip_temp  = rcar_thermal_get_trip_temp,
 276         .notify         = rcar_thermal_notify,
 277 };
 278
 279 /*
 280  *              interrupt
 281  */
 282 #define rcar_thermal_irq_enable(p)      _rcar_thermal_irq_ctrl(p, 1)
 283 #define rcar_thermal_irq_disable(p)     _rcar_thermal_irq_ctrl(p, 0)
 284 static void _rcar_thermal_irq_ctrl(struct rcar_thermal_priv *priv, int enable)
 285 {
 286         struct rcar_thermal_common *common = priv->common;
 287         unsigned long flags;
 288         u32 mask = 0x3 << rcar_id_to_shift(priv); /* enable Rising/Falling */
 289
 290         spin_lock_irqsave(&common->lock, flags);
 291
 292         rcar_thermal_common_bset(common, INTMSK, mask, enable ? 0 : mask);
 293
 294         spin_unlock_irqrestore(&common->lock, flags);
 295 }
 296
 297 static void rcar_thermal_work(struct work_struct *work)
 298 {
 299         struct rcar_thermal_priv *priv;
 300
 301         priv = container_of(work, struct rcar_thermal_priv, work.work);
 302
 303         rcar_thermal_update_temp(priv);
 304         rcar_thermal_irq_enable(priv);
 305         thermal_zone_device_update(priv->zone);
 306 }
 307
 308 static u32 rcar_thermal_had_changed(struct rcar_thermal_priv *priv, u32 status)
 309 {
 310         struct device *dev = rcar_priv_to_dev(priv);
 311
 312         status = (status >> rcar_id_to_shift(priv)) & 0x3;
 313
 314         if (status & 0x3) {
 315                 dev_dbg(dev, "thermal%d %s%s\n",
 316                         priv->id,
 317                         (status & 0x2) ? "Rising " : "",
 318                         (status & 0x1) ? "Falling" : "");
 319         }
 320
 321         return status;
 322 }
 323
 324 static irqreturn_t rcar_thermal_irq(int irq, void *data)
 325 {
 326         struct rcar_thermal_common *common = data;
 327         struct rcar_thermal_priv *priv;
 328         unsigned long flags;
 329         u32 status, mask;
 330
 331         spin_lock_irqsave(&common->lock, flags);
 332
 333         mask    = rcar_thermal_common_read(common, INTMSK);
 334         status  = rcar_thermal_common_read(common, STR);
 335         rcar_thermal_common_write(common, STR, 0x000F0F0F & mask);
 336
 337         spin_unlock_irqrestore(&common->lock, flags);
 338
 339         status = status & ~mask;
 340
 341         /*
 342          * check the status
 343          */
 344         rcar_thermal_for_each_priv(priv, common) {
 345                 if (rcar_thermal_had_changed(priv, status)) {
 346                         rcar_thermal_irq_disable(priv);
 347                         schedule_delayed_work(&priv->work,
 348                                               msecs_to_jiffies(300));
 349                 }
 350         }
 351
 352         return IRQ_HANDLED;
 353 }
 354
 355 /*
 356  *              platform functions
 357  */
 358 static int rcar_thermal_probe(struct platform_device *pdev)
 359 {
 360         struct rcar_thermal_common *common;
 361         struct rcar_thermal_priv *priv;
 362         struct device *dev = &pdev->dev;
 363         struct resource *res, *irq;
 364         int mres = 0;
 365         int i;
 366         int idle = IDLE_INTERVAL;
 367
 368         common = devm_kzalloc(dev, sizeof(*common), GFP_KERNEL);
 369         if (!common) {
 370                 dev_err(dev, "Could not allocate common\n");
 371                 return -ENOMEM;
 372         }
 373
 374         INIT_LIST_HEAD(&common->head);
 375         spin_lock_init(&common->lock);
 376         common->dev = dev;
 377
 378         irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 379         if (irq) {
 380                 int ret;
 381
 382                 /*
 383                  * platform has IRQ support.
 384                  * Then, drier use common register
 385                  */
 386                 res = platform_get_resource(pdev, IORESOURCE_MEM, mres++);
 387                 if (!res) {
 388                         dev_err(dev, "Could not get platform resource\n");
 389                         return -ENODEV;
 390                 }
 391
 392                 ret = devm_request_irq(dev, irq->start, rcar_thermal_irq, 0,
 393                                        dev_name(dev), common);
 394                 if (ret) {
 395                         dev_err(dev, "irq request failed\n ");
 396                         return ret;
 397                 }
 398
 399                 /*
 400                  * rcar_has_irq_support() will be enabled
 401                  */
 402                 common->base = devm_request_and_ioremap(dev, res);
 403                 if (!common->base) {
 404                         dev_err(dev, "Unable to ioremap thermal register\n");
 405                         return -ENOMEM;
 406                 }
 407
 408                 /* enable temperature comparation */
 409                 rcar_thermal_common_write(common, ENR, 0x00030303);
 410
 411                 idle = 0; /* polling delaye is not needed */
 412         }
 413
 414         for (i = 0;; i++) {
 415                 res = platform_get_resource(pdev, IORESOURCE_MEM, mres++);
 416                 if (!res)
 417                         break;
 418
 419                 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 420                 if (!priv) {
 421                         dev_err(dev, "Could not allocate priv\n");
 422                         return -ENOMEM;
 423                 }
 424
 425                 priv->base = devm_request_and_ioremap(dev, res);
 426                 if (!priv->base) {
 427                         dev_err(dev, "Unable to ioremap priv register\n");
 428                         return -ENOMEM;
 429                 }
 430
 431                 priv->common = common;
 432                 priv->id = i;
 433                 mutex_init(&priv->lock);
 434                 INIT_LIST_HEAD(&priv->list);
 435                 INIT_DELAYED_WORK(&priv->work, rcar_thermal_work);
 436                 rcar_thermal_update_temp(priv);
 437
 438                 priv->zone = thermal_zone_device_register("rcar_thermal",
 439                                                 1, 0, priv,
 440                                                 &rcar_thermal_zone_ops, NULL, 0,
 441                                                 idle);
 442                 if (IS_ERR(priv->zone)) {
 443                         dev_err(dev, "can't register thermal zone\n");
 444                         goto error_unregister;
 445                 }
 446
 447                 list_move_tail(&priv->list, &common->head);
 448
 449                 if (rcar_has_irq_support(priv))
 450                         rcar_thermal_irq_enable(priv);
 451         }
 452
 453         platform_set_drvdata(pdev, common);
 454
 455         dev_info(dev, "%d sensor proved\n", i);
 456
 457         return 0;
 458
 459 error_unregister:
 460         rcar_thermal_for_each_priv(priv, common)
 461                 thermal_zone_device_unregister(priv->zone);
 462
 463         return -ENODEV;
 464 }
 465
 466 static int rcar_thermal_remove(struct platform_device *pdev)
 467 {
 468         struct rcar_thermal_common *common = platform_get_drvdata(pdev);
 469         struct rcar_thermal_priv *priv;
 470
 471         rcar_thermal_for_each_priv(priv, common)
 472                 thermal_zone_device_unregister(priv->zone);
 473
 474         platform_set_drvdata(pdev, NULL);
 475
 476         return 0;
 477 }
 478
 479 static struct platform_driver rcar_thermal_driver = {
 480         .driver = {
 481                 .name   = "rcar_thermal",
 482         },
 483         .probe          = rcar_thermal_probe,
 484         .remove         = rcar_thermal_remove,
 485 };
 486 module_platform_driver(rcar_thermal_driver);
 487
 488 MODULE_LICENSE("GPL");
 489 MODULE_DESCRIPTION("R-Car THS/TSC thermal sensor driver");
 490 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");